Control apparatus, imaging apparatus, and control method
A control apparatus includes a detector configured to detect a moving amount of an object image on an imaging plane based on shake information acquired from a shake detector and motion vector information acquired from an image signal, a calculator configured to calculate an object angular velocity based on the moving amount of the object image, the motion vector information, and a cycle of acquiring the object image, and a corrector configured to perform an image stabilization based on the object angular velocity.
1. A control apparatus comprising:
a detector configured to detect a moving amount of an object image on an imaging plane based on (a) shake information acquired from a shake detector and (b) motion vector information acquired from an image signal;
a calculator configured to calculate an object angular velocity based on (a) the moving amount of the object image, (b) the motion vector information, and (c) a cycle of acquiring the object image; and
a corrector configured to perform an image stabilization based on the object angular velocity,
wherein the calculator calculates a gain based on (a) vector information in a background area among the motion vector information and (b) a moving amount on the imaging plane based on the shake information, and
wherein the calculator calculates the object angular velocity using a value acquired by multiplying a focal length by the gain.
2. The control apparatus according to claim 1 , wherein when an offset component of the shake detector is smaller than a predetermined threshold, the calculator calculates the object angular velocity using the value acquired by multiplying the focal length by the gain.
3. The control apparatus according to claim 1 , wherein when the offset component of the shake detector is larger than the predetermined threshold, the calculator calculates the object angular velocity using the focal length without using the gain.
4. The control apparatus according to claim 1 , wherein the calculator changes a calculation method of the object angular velocity according to an imaging status.
5. The control apparatus according to claim 4 , wherein when the imaging status is a first status, the calculator calculates the object angular velocity based on information acquired from a lens apparatus, and
wherein when the imaging status is a second status, the calculator calculates the object angular velocity based on (a) the moving amount of the object image, (b) the motion vector information, and (c) the cycle of acquiring the object image.
6. The control apparatus according to claim 5 , wherein when the imaging status is the first status, the calculator calculates the object angular velocity based on (a) the motion vector information, (b) the cycle of acquiring the object image, (c) a first distance to the object based on a front principal point of an imaging optical system in the lens apparatus, (d) a second distance to an imaging plane based on a rear principal point of the imaging optical system, and (e) a third distance between the object and the imaging plane.
7. An imaging apparatus comprising:
an image sensor configured to perform a photoelectric conversion for an object image;
a detector configured to detect a moving amount of an object image on an imaging plane based on (a) shake information acquired from a shake detector and (b) motion vector information acquired from an image signal;
a calculator configured to calculate an object angular velocity based on (a) the moving amount of the object image, (b) the motion vector information, and (c) a cycle of acquiring the object image; and
a corrector configured to perform an image stabilization based on the object angular velocity,
wherein the calculator calculates a gain based on (a) vector information in a background area among the motion vector information and (b) a moving amount on the imaging plane based on the shake information, and
wherein the calculator calculates the object angular velocity using a value acquired by multiplying a focal length by the gain.
8. A control method comprising the steps of:
detecting a moving amount of an object image on an imaging plane based on (a) shake information acquired from a shake detector and (b) motion vector information acquired from an image signal;
calculating an object angular velocity based on (a) the moving amount of the object image, (b) the motion vector information, and (c) a cycle of acquiring the object image; and
correcting an object blur based on the object angular velocity,
wherein the calculating comprises (1) calculating a gain based on (a) vector information in a background area among the motion vector information and (b) a moving amount on the imaging plane based on the shake information and (2) calculating the object angular velocity using a value acquired by multiplying a focal length by the gain.